Multimedia Conferencing Requirements for SIP Based Systems

1
Multimedia Conferencing Requirements for SIP
Based Systems

• draft-levin-sip-for-video-01.txt
• Orit Levin
• Orit_at_radvision.com
• Roni Even
• Roni.Even_at_polycom.co.il

2
The Objectives for Adding Multimedia
Conferencing for SIP to SIP/SIPPING Charter

• Provide a (BCP) Guide for Building Interoperable
  SIP-based MULTIMEDIA Conferencing Applications
• The Timing for this Work is Excellent

3
Our Roadmap

• THE DRAFT Puts together the Requirements that
  are necessary for participation (and optional
  hosting) of MULTIMEDIA Conferencing in a standard
  way
• THE NEXT STEP Write a Framework that maps the
  requirements to documents describing the
  solutions

4
Our Functionality Guidelines

• Make Multimedia (Conferencing) calls work like
  Voice-only calls
• Similar user experience
• Simple migration from Voice-only conferencing
  applications
• Enable SIP Multimedia Conferencing with basic
  User Agents
• Voice only
• Non-conferencing aware

5
Our Design Guidelines Base the solution on
existing works whenever possible

• Call Control SIPPING
• draft-ietf-sipping-cc-framework-00.txt
• Capabilities Exchange/Declaration MMUSIC
• draft-andreasen-mmusic-sdp-simcap-05.txt
• T.120 and other application integration MMUSIC
• Media Control AVT/MMUSIC/SIPPING Open Issue -gt
  Next Slide
• Conferencing and Floor Control SIPPING
• draft-ietf-sipping-conferencing-models-00.txt
• draft-rosenberg-sip-call-package-00.txt
• draft-miladinovic-sip-multiparty-ext-00.txt

6
Critical Open Design Issue Media Control Is
the Solution in AVT, MMUSIC, or Somewhere Else?

• Examples of Media Control
• Change CODEC modes Resolution, Frame Rate
• Video Fast Update, Video Freeze
• Implications on SIP-based Applications
• Distributed model (control and media) is hard to
  implement
• Voice and Video corresponding primitives are
  defined in different protocols
• RTP/RTCP are not reliable (UDP!)

7
Critical Open Design Issue Media Control Is an
Informal Ad-hock Meeting Required ?

• AVT options
• RTCP draft-ietf-avt-rtcp-feedback-02.txt
• RTP draft-rajeshkumar-avt-sse-00.txt
• MMUSIC options
• Use SDP
• Somewhere Else
• Introduce a new Control Protocol

8
Going Forward

• Write a Framework that Maps the Requirements to
  Solutions
• Point to Existing Drafts and Approaches Whenever
  Possible
• Base the work on (and provide inputs to) the
  Multi-party Application Framework